chore: migrate wdf to git submodule

.github/workflows/ci-validation.yml

@@ -34,6 +34,8 @@ jobs:
     steps:
       - name: Checkout
         uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd  # v6.0.2
+        with:
+          submodules: true
 
       - name: Setup MSBuild
         uses: microsoft/setup-msbuild@30375c66a4eea26614e0d39710365f22f8b0af57  # v3.0.0

.gitmodules

@@ -0,0 +1,3 @@
+[submodule "ThirdParty/Windows-Driver-Frameworks"]
+	path = ThirdParty/Windows-Driver-Frameworks
+	url = https://github.com/microsoft/Windows-Driver-Frameworks.git

README.md

@@ -35,6 +35,20 @@ Explore more games, tools, apps, and experiments from PyroSoft: **[Visit PyroSof
 - **EDID integration**: Added EDID integration support for custom/virtual monitor profiles.
 - **Performance optimization**: Driver performance improvements (various internal optimizations).
 
+## Building from source
+
+This repository uses a Git submodule for Microsoft Windows Driver Frameworks headers. Clone with submodules enabled:
+
+```bash
+git clone --recurse-submodules https://github.com/VirtualDrivers/Virtual-Display-Driver.git
+```
+
+For an existing checkout, initialize the submodule before building:
+
+```bash
+git submodule update --init --recursive
+```
+
 ## ⬇️ Download Latest Version
 
 - [Driver Installer (Windows 10/11)](https://github.com/VirtualDrivers/Virtual-Display-Driver/releases) - Check the [Releases](https://github.com/VirtualDrivers/Virtual-Display-Driver/releases) page for the latest version and release notes.